Upgrading from 2.2.4 to 3.0.X cause 'Extras' for Visual Effects on Ubuntu 9.04 to not work anymore.

Description

When upgrading from VirtualBox 2.2.4 to 3.0.2, my Ubuntu 9.04 (64bit) Guest is unable to turn on 'Extras' Visual Effects on Ubuntu, even after updating the Guest Additions. I have also tried a fresh install of VirtualBox 3.02 on my system and installed a fresh copy of Ubuntu 9.04 (64bit) on it. I then installed Guest Additions 3.0.2, installed Desktop Effects, installed Compiz Config, (by this time in VBox 2.2.4 the 'Extras' option works) and VirtualBox 3.02 says 'Extras' cannot be enabled. When using VirtualBox 2.2.4, I am able to turn on 'Extras' on Ubuntu 9.04 with no problem.